test: prune test deps of dependencies

[cho-m]

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same change?
• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes? Here's an example.
• Have you successfully run brew style with your changes locally?
• Have you successfully run brew typecheck with your changes locally?
• Have you successfully run brew tests with your changes locally?

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Test dependencies of test dependencies are added to missing dependencies list, e.g. In following, python@3.11 is not needed to test:

❯ brew install zurl
==> Downloading https://ghcr.io/v2/homebrew/core/zurl/manifests/1.12.0
...

❯ brew test zurl
Error: zurl is missing test dependencies: python-setuptools python@3.11 libcython python-packaging

Need to make sure this isn't accidentally removing wanted dependencies as not familiar with recursive dependency logic.

[MikeMcQuaid]

Think this makes sense to me but CC @Bo98 to double check before merging.

[Bo98]

Seems correct, though I'm surprised we haven't hit this issue with test-bot etc?

[cho-m]

Seems correct, though I'm surprised we haven't hit this issue with test-bot etc?

May also need to check what brew install --only-dependencies --include-test (or whatever other commands test-bot runs) is installing. It may be including more than necessary.

We've seen CI install some extra formulae deps before. Recently there were reports of this from the Python lib formulae that build multiple bindings (which we will hopefully clean up soon).

[MikeMcQuaid]

Thanks again @cho-m!